find who is log in in linux server

1) pinky command will show ips that user lo in from(actually name already there)
Login    Name                 TTY      Idle   When             Where
sprathaban fisrname lastname    pts/1    17:34  2013-08-26 13:27 10.136.xx.xxx
2)windows
nbtstat -A 10.136.xxx.xxx


Local Area Connection:
Node IpAddress: [10.136.xxx.xxx] Scope Id: []

           NetBIOS Remote Machine Name Table

       Name               Type         Status
    ---------------------------------------------
    GCHELLIAH-DT   00  UNIQUE      Registered

    MAC Address = 00-1E-0B-xx-xx-xx